Backpack



FIG. 1 is a front elevational view of a backpack showing my new design;

FIG. 2 is a right side view of the bag;

FIG. 3 is a rear elevational view of the bag;

FIG. 4 is a left side view of the bag;

FIG. 5 is a top plan view of the bag;

FIG. 6 is a bottom plan view of the bag;

FIG. 7 is an elevated perspective view showing the front and the right side of the bag, the broken lines being understood to represent conventional stitching; and,

FIG. 8 is an elevated perspective view showing the back and the left side of the bag. 

The ornamental design for a backpack, as shown and described. 